Improvement in casting plow-points



G. wlARn. K

` Casting'PIow-Poinrts., hlm-165,046', .,Patenfeqlunezgnsi THE GRAPHICC0.PHOT0L|TH.39 H: 4! PARK PLAGEJLY.

UNITED STATES PATENT OEEIOE.

GEORGEY WIARD, OE EAsT AVON, NEW YORK, AssIGNoR OE ONE-.HALE His RIGHTTo o. w. BOUGE, OE SAME PLACE.

lMPROVEME-NTVIN CASTING PLOW-POINTS.

Specification forming part of Letters Patent No. 165,016, dated J une29,1875 application tiled May 11, 1875.

provided on the rear side with two converging flanges, forming a socketfor securing the lower end of the beam or mold-board in place.

Previous to my invention the molding and casting of these plow-pointshas been attended with considerable loss of time and material from thefollowing causes: In molding these points the sand composing thewedge-shaped portion of the mold which forms the angular socket in thecastin g has to be rammed tightly, in order to render the tip of thisportion su fiiciently strong to resist theV pressure of the gases andmolten iron. When so packed the sand is apt to adherel to the pattern,in conse quence whereof a portion of the tip is frequently detached fromthe mold in withdrawy ing the pattern, thus requiring the latter to bereplaced, sometimes several times, before the' mold is completed. Asthese plow-points have to be cast with the flanges downward, the escapeof the air and gases from the chamber formed within the mold is sodifficult and slow as to frequently prevent the molten iron from fillingthe mold, causing air-spaces in the casting, which render the same unfitfor use. Furthermore, in pouring the molton iron into the mold, theformer', in entering under the tip of the wedge-shaped portion,frequently raises or deranges the same, whereby the casting is spoiled.

The object of my invention is to remedy these defects; and it consistsin constructing one of the Vflanges on the back of the plowpoint neartheir point of intersection, with a notch or recess, which enables themold to be formed with a corresponding bridge or support, whichstrengthens or braces the tip of` the wedge-shaped portion of the mold,facilitates the molding, and furnishes an escape for the airv and gasesduring the'process of lcast- 1n g.

In the accompanying drawing, Figurel is a rear elevation of a plow-pointprovided with my improvement. Fig: 2 is a bottom edge view thereof. Fig.3 is a section in line a' fc,

Fig. l. Fig. 4 is a rear view of the point with the lower end of thebeam inserted in its socket.

Like letters of reference designate like parts in each of the figures. i

A is the curved body of the plow-point, and B B the flan ges arranged`on its rear side, forming a socket for the reception of the lower end Cof the beam lin plows having iron beams, and of the moldboard in plowsconstructed with wooden beams. d is the notch or recess formed in thedange B at or near the point at which it meets the flange B', as clearlyshown in the drawing. The notch d is represented in the mold by acorresl'ionding bridge of sand connecting the tip of the wedge-shapedpfor-v tion of the mold with the sand on thc outer side of the ange B.This bridge forms a brace or support for the tip of sand, rmlyconnecting it with the other parts of the mold, and preventing its beingwithdrawn with the pattern or deranged by the action ot' the airV andgases or the intlowing molten iron, while i at the same time it forms acommunication bctween the different bodies of sand composing the mold,so as to permit a more ready escape of the air and gases confined andgenerated therein, thereby insuring the production of sound and perfectcastings with facility and dispatch.

rlhe en d G of the beam or moldboard is prefl 'erably provided with aprojecting extension or lip, c, fitting in the slot d of the flange B,and forming an additional fastening or con nection between the beam ormold-board and plow-point.

What I claim as my invention is- A plow-point provided on its rear sid'ewith anges B B and notch d, substantially as and for the purposehereinbefore set forth.

. GEORGE WIARD.

Witnesses:

F. RAMsDEN, IsAAc DIBBLE.

